The leaf colour of certain plants is controlled by one gene. For that gene, the allele $G =$ orange and $g =$ green. You have a plant with orange leaves, but do not know whether that plant's genotype is $GG$ or $Gg.$

If you cross your unknown plant with one of the plants whose genotype is listed below, you will be able to determine your unknown's genotype. With which plant would you cross it?

Mendel's contribution for genetic inheritance was

Definitions / Explanation : Heterozygous
 

In pea hybrids between red flowered and white flowered strains were crossed back to pure red flowered strain. The progeny of this cross will have

An organism with two identical alleles for a given trait is